Hide or show the rulers around the left and top sides of the canvas.
Use pressure sensitivity with graphics tablets.
Persistent Offset for Clone Tool
Change the default behavior for the origin pointer when using the Clone 
tool. See Clone.
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The area copied moves with the pointer when this option is selected. This is the default setting.
This happens even when the mouse button is released, enabling you to copy multiple areas within a picture, and to clone recently cloned areas. -
If Persistent Offset for Clone Tool is not selected, when the mouse button is released the origin point reverts to its original position. The same area is then copied each time Clone is used.
This is useful when copying the same motif repeatedly in different part of a picture.
Right-click and select Reset Origin from the context menu, or press the Ctrl key, to reset the origin point when cloning.